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Mitsubishi Ecodan fault 16

When a PUHZ-FRP outdoor unit is connected and in heat recovery operation, the set...

Heat pump

What it means

When the outdoor unit prioritizes cooling operation of the air conditioner indoor unit over the cylinder unit, the outdoor unit controls compressor frequency according to the air conditioner load, and DHW/heating run according to that frequency, which can prevent reaching set temperature.

Likely causes

  1. Outdoor unit set to prioritize cooling operation of air conditioner indoor unit over cylinder unit
  2. Compressor frequency controlled by air conditioner load rather than DHW/Heating load

Where to start

  1. Check outdoor unit priority settings (air conditioner vs cylinder unit)
  2. Refer to PUHZ-FRP installation manual for priority settings if Air-to-Water system should be given priority
  3. Enter request code 103 to view the latest (most recent) error history code; displays '- -' if no history present

The full answer, free

  • 10 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 56), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Mitsubishi manual for the Ecodan. Check the model on the data plate before you order parts.

Other Mitsubishi Ecodan fault codes